docs: Fixed typos (#14940)
docs: Fixed typos (#14940)

Fixed typos inside envoy/docs/root/start/quick-start/securing.rst

Signed-off-by: Rajdeep Roy Chowdhury <b7c4fae30cb3a8c986d92cee66b2696cc0279157@gmail.com>
lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy